EP4361491A1 - Protective door monitoring module - Google Patents

Abstract

Protective door monitoring module (16) for monitoring a state of a protective door, comprising a base unit (34) for generating a protective door signal, which has an actuator receptacle (38) for receiving an actuator (36) and is designed to generate a protective door signal when the actuator (36) is inserted into the actuator receptacle (38) of the base unit (34), wherein the base unit (34) has an axis (50) and a first end face (51) arranged transversely to the axis (50) with a first interface (44); and a mounting bracket (46) with a second interface (48) which is designed to be coupled to the first interface (44) of the base unit (34) in a first position, a second position rotated 90° clockwise about the axis (50) of the base unit (34) to the first position, and a third position rotated 90° clockwise about the axis (50) of the base unit (34) to the second position; wherein the first interface (44) and the second interface (48) have a mechanical locking device (90) which is designed to prevent coupling of the first interface (44) to the second interface (48) in a fourth position rotated 90° clockwise about the axis (50) of the base unit (34) to the third position.

Description

The present invention relates to a protective door monitoring module with a basic device for monitoring a state of a protective door.

According to a further aspect, the present invention relates to a protective door with a protective door monitoring module of the above-mentioned type, wherein the base unit is arranged on a first part of the protective door and an actuator is arranged on a second part of the protective door, wherein the first part and the second part of the protective door are separated from one another when the protective door is opened.

According to a further aspect, the present invention relates to a protective door monitoring system with a protective door as access to a safety area, a protective door monitoring module of the type mentioned above, and a control unit which is designed to read the protective door signal and to control a machine or system located in the safety area depending on the protective door signal.

Safety door monitoring modules of the type mentioned above are often also referred to as safety switches. Examples of safety door monitoring modules or safety switches of the type mentioned above are from the EN 10 2005 057 108 A1 , the DE 103 05 704 B3 , the EN 10 2008 060 004 A1 and from the EN 10 2020 120 817 A1 known.

Protective door monitoring modules of this type are used on protective doors, protective flaps and the like. Although the terms "protective door monitoring module" and "protective door" are used here, the protective door monitoring module according to the invention can be used on any type of separating protective device. The term "protective door" is to be interpreted broadly in the present sense. Instead of the general term "separating protective device", the term "protective door" is therefore used exclusively in the following, without this being intended to result in a restriction of the protection area.

Safety doors, on which the safety door monitoring module according to the invention can be used, for example, typically serve as access to a safety area in which an automated machine or system is located. The machine can be, for example, a robot, a machine tool with a fast-rotating spindle, a transport or conveyor system, a press or another machine or system whose operation poses a danger to people who are in the safety area mentioned or in the working area of the machine. The safety door monitoring module can serve as a signaling device with the help of which a control unit can detect the closed state of the safety door. The control unit is set up to read the safety door signal generated by the safety door monitoring module and to control the machine depending on the safety door signal. For example, the machine can only be operated when the safety door signal is present. In other words, the control unit is set up to only enable the machine or system to be operated when it receives the safety door signal from the safety door monitoring module, i.e. when the safety door is closed. However, if the protective door is opened during operation (if possible), the control unit must bring the machine or system into a safe state by, for example, switching off the power supply to the machine or system.

There are a large number of machines and systems that pose a risk for a certain period of time even after they have been switched off, for example because the machine or system is still running. For such applications, safety door monitoring modules are required that prevent the safety door from opening until the machine or system has reached a safe state. This function is known as guard locking.

Typically, safety door monitoring modules of this type have a so-called actuator and an actuator holder that acts as a counterpart to it. The actuator holder is part of a base unit, which typically houses other electronic components and from which the connecting cables that connect the safety door monitoring module to the control unit usually originate. Accordingly, the base unit with the actuator holder is preferably arranged on a stationary part of the safety door (e.g. on a door frame), while the actuator is preferably arranged on a movable part of the safety door (e.g. on a movable door leaf). This has the advantage that the part of the safety door monitoring module that is arranged on the movable part of the safety door does not have to be supplied with power, since usually only the base unit of the safety door monitoring module needs to be supplied with power.

When the safety door is closed, the actuator engages the actuator holder, which is detected using one or more sensors. In a safety door monitoring module with guard locking, the actuator is also blocked or locked in the actuator holder to prevent it from being pulled back. The so-called guard locking therefore preferably has a locking device for locking the actuator in the actuator holder.

In the latter case, the safety door monitoring module therefore fulfils two functions, namely a detection function, which is used to detect the closed position of the safety door, and a locking function, which prevents the safety door from opening as long as the actuator is locked in the actuator holder. The actuator can be released, for example, via an electromotive actuator that is operated by the control unit as soon as the monitored machine or system has reached its safe state.

A safety door monitoring module of this type is sold by the applicant under the name PSENmlock. This safety door monitoring module works perfectly and is versatile. If the actuator of the safety door monitoring module is essentially rod- or pin-shaped and the actuator holder acting as a counterpart is designed as a continuous groove, a U-shaped opening or a blind or through hole into which the rod- or pin-shaped actuator is inserted, this type of design results in a relatively high potential for injuries, since the actuator in particular is dangerous to injury due to its shape. On the other hand, the actuator and actuator holder must be aligned relatively precisely with one another, since otherwise the rod- or pin-shaped actuator will not exactly hit the position of the corresponding continuous groove, the corresponding U-shaped opening, the corresponding blind hole or the corresponding through hole and thus cannot be inserted into these.

In the EN 10 2020 120 817 A1 A protective door monitoring module is described which, due to a ring-shaped actuator element, offers increased flexibility in relation to different installation situations compared to a rod or pin-shaped actuator.

Nevertheless, depending on the installation situation, the position and alignment of the actuator must be adjusted relative to the actuator holder for the reasons mentioned above. The installation situation can be characterized, for example, by the type of safety door (e.g. swing safety door or sliding safety door), by the spatial alignment of the immovable part of the safety door and the movable part of the safety door relative to each other and/or by the available installation space on the movable or immovable part of the safety door, etc.

In addition, there is the possibility of incorrect installation, in which a user installs the protective door monitoring module in such a way that the actuator and actuator holder are in the same spatial position and are spatially aligned to one another in such a way that the actuator cannot be inserted into the actuator holder.

It is therefore an object of the present invention to provide a protective door monitoring module which is easy and flexible to handle for a user with regard to different installation situations and prevents incorrect installation.

This object is achieved on the basis of a protective door monitoring module of the type mentioned at the outset in that the protective door monitoring module has a base unit with an actuator receptacle and a mounting bracket which is designed to be coupled to an interface of the base unit in a first position, a second position rotated 90° clockwise about the axis of the base unit relative to the first position, and a third position rotated 90° clockwise about the axis of the base unit relative to the second position, wherein the mounting bracket and the base unit have a mechanical locking device which is designed to prevent coupling of the mounting bracket to the interface of the base unit in a fourth position rotated 90° clockwise about the axis of the base unit relative to the third position.

The advantage of the present invention is that a user (e.g. a fitter) can easily and flexibly install the safety door monitoring module in different installation situations. One and the same basic device can be aligned and attached to a mounting surface on a safety door in different spatial orientations using the mounting bracket, depending on the installation situation. For example, the mounting bracket is coupled to the basic device in a first position, a second position or a third position and attached to a mounting surface or safety door (e.g. a door frame) so that the actuator holder can accommodate the actuator.

At the same time, incorrect assembly of the base unit in relation to an alignment of the base unit that is not suitable for receiving the actuator is advantageously avoided by the mounting bracket only being able to be attached to the base unit in the specified positions and thus the base unit can only be attached in specified alignments relative to a mounting surface or to a safety door. An unfavorable alignment of the safety door monitoring module relative to a mounting surface, where the actuator cannot or can only poorly engage in the actuator holder, is avoided by the base unit and the mounting bracket having a mechanical The mechanical locking device prevents the mounting bracket from being coupled to the base unit in the fourth position.

The above task is therefore completely solved.

According to a preferred embodiment, the mounting bracket has a mounting side which is arranged transversely to the second interface of the mounting bracket, wherein the actuator receptacle is designed to receive an actuator from a first direction, from a second direction rotated 90° counterclockwise to the first direction about the axis of the base unit, and from a third direction rotated 90° counterclockwise to the second direction about the axis of the base unit, and wherein in the first position the mounting side is orthogonal to the first direction, in the second position the mounting side is orthogonal to the second direction, and in the third position the mounting side is orthogonal to the third direction.

In other words, the actuator holder of the base unit is designed to receive the actuator from three different directions, with the first direction, the second direction and the third direction being successively rotated by 90° around the longitudinal axis of the base unit in an anti-clockwise direction. When the mounting bracket is in the first position or in the third position, the first direction in which the actuator can be received is orthogonal to the mounting side. If, however, the mounting bracket is in the second position, the second direction in which the actuator can be received is orthogonal to the mounting side.

To mount the safety door monitoring module on a safety door or mounting surface, the mounting side of the mounting bracket can be aligned parallel to the safety door or mounting surface.

Preferably, the mounting bracket has a substantially L-shaped cross-section.

According to a further embodiment, the mechanical locking device has a mechanical locking element and a recess, wherein one of the two interfaces has the mechanical locking element and the other interface has the recess, which is designed to receive the mechanical locking element in the first position, the second position and the third position and to prevent the fourth position.

In other words, the recess and the mechanical locking element work together in a similar way to a groove and a key. In the fourth position, the mechanical locking element cannot engage in the recess, so that coupling of the base unit with the mounting bracket is prevented in the fourth position. In contrast, the mechanical locking element can engage in the recess in the first position, the second position and the third position.

It is understood that the mounting bracket can only be coupled to the base unit in one position at a time. In other words, the mounting bracket cannot be coupled to the base unit in two positions at the same time.

The mechanical locking device has the advantage that coupling of the mounting bracket with the base unit is avoided in the fourth position. The fourth position is an unsuitable position. An unsuitable position means an orientation of the mounting bracket with respect to the base unit in which the base unit, when mounted, is oriented on a protective door or a mounting surface in such a way that an actuator cannot or can only with difficulty engage in the actuator holder.

The mechanical locking device therefore acts as a protection against incorrect assembly. This has a positive effect on the assembly process of the safety door monitoring module on a safety door or a mounting surface, as the user is relieved of considerations related to assembly and time-consuming modifications that follow incorrect assembly are avoided.

For example, one interface can have three spatially separated recesses, each of which is designed to accommodate the mechanical locking element in a specific position of the mounting bracket. In other words, according to this example, a first recess is designed to accommodate the mechanical locking element in the first position, a second recess is designed to accommodate the mechanical locking element in the second position, and a third recess is designed to accommodate the mechanical locking element in the third position. Since the mechanical locking element cannot be accommodated in the fourth position, the mounting bracket cannot be coupled to the base unit in the fourth position.

In a preferred embodiment, the mounting bracket has the mechanical locking element and the base unit has the corresponding recess. It is also possible for the base unit to have the mechanical locking element and the mounting bracket to have the recess.

According to a further embodiment, the recess is a recess that runs around the axis of the basic device by less than 360°.

Compared to the above example with spatially separated recesses, the recess with less than 360° circumferential radius has the advantage that the mounting bracket can be rotated (continuously), for example, from the first position to the second position and/or from the second position to the third position, without the mounting bracket having to be moved axially parallel to the axis of the base unit. This makes installation of the protective door monitoring module simple and convenient for the user.

Another advantage of the recess that is less than 360° is that the mounting bracket cannot make multiple complete rotations around the axis of the basic device without axial movement in a direction parallel to the axis of the basic device. This is particularly advantageous if the safety door monitoring module has a plug. If the plug is connected to the basic device via electrical If electrical connections are connected, these electrical connections, such as stranded wires or cables, should be protected from being twisted multiple times. Otherwise, the electrical connections could be damaged or even torn off.

Preferably, the recess has an angular range greater than 180°.

According to a further embodiment, the base unit and/or the mounting bracket has a first axial lock which axially secures the mounting bracket along the axis of the base unit.

This has the advantage that a user does not have to manually secure the mounting bracket axially during assembly. This simplifies the assembly process. In particular, a user can rotate the mounting bracket from one position to another position without manually securing the mounting bracket axially in a direction parallel to the axis of the base unit, for example from the first position to the second position and/or from the second position to the third position.

According to a further embodiment, the basic device has a detachably attached side wall which has a part of the first axial securing means.

In other words, the base unit has a side wall which can be detached from the base unit and reattached thereto, and at least a part of the first axial securing means is arranged on this side wall.

This design has the particular advantage that the first axial lock can only be released when the detachably attached side wall is detached from the base unit. This can have a positive effect on the assembly process, as a user automatically uses the mounting bracket and the base unit together or "holds it in their hand" and therefore cannot, for example, "lose" the mounting bracket.

Furthermore, unwanted access to the base unit via the first interface can be limited by allowing only authorized users to open the detachably attached side panel of the base unit can be loosened or fastened or unauthorized access is visually recognizable. For example, one or more screws that attach the detachably attached side panel to the base unit can be secured with locking varnish.

According to a further embodiment, the mounting bracket has a mounting side which is arranged transversely to the second interface of the mounting bracket, wherein the base device has a first through hole and a second through hole running orthogonal to the first through hole, and wherein in the first position and the third position the first through hole runs orthogonal to the mounting side and in the second position the second through hole runs orthogonal to the mounting side.

In other words, a longitudinal axis of the first through hole runs orthogonal to the mounting side of the mounting bracket when the mounting bracket is coupled to the base unit in the first position. The longitudinal axis of a through hole means the axis along which the through hole extends or along which the through hole was manufactured (e.g. drilled) or along which a fastening means can be accommodated. If the mounting bracket is coupled to the base unit in the second position, a longitudinal axis of the second through hole runs orthogonal to the mounting side. If the mounting bracket is coupled to the base unit in the third position, the longitudinal axis of the first through hole again runs orthogonal to the mounting side.

The first through hole and the second through hole are each designed to receive a fastening means. Therefore, the protective door monitoring module can be attached to the protective door or mounting surface by means of a fastening means which is received by either the first through hole or the second through hole. This has the advantage that the protective door monitoring module has a further fastening point on one of the protective doors or mounting surfaces - in addition to the fastening point on the mounting side of the mounting bracket. This can improve the mechanical stability of the connection between the base unit and the mounting surface or the protective door. The fastening means preferably has a screw.

According to a further embodiment, the mounting bracket has a mounting side which is arranged transversely to the second interface of the mounting bracket, wherein the base unit has a first side surface, a second side surface and a third side surface which are arranged substantially transversely to the first end face, and wherein the mounting side of the mounting bracket is aligned with the first side surface or parallel to it in the first position, aligned with the second side surface or parallel to it in the second position and aligned with the third side surface or parallel to it in the third position.

This design has the particular advantage that in the first position, the second position and the third position, one of the side surfaces of the base unit is parallel to the mounting side of the mounting bracket or is aligned with it. If the mounting side is connected to a protective door or a mounting surface, one of the side surfaces of the base unit is also parallel to the protective door or mounting surface or is aligned with it. If the base unit is in contact with the protective door or mounting surface, this can have a positive effect on the mechanical stability of the protective door monitoring module.

The term "transverse" does not necessarily mean perpendicular or orthogonal. Instead, "transverse" includes any orientation at any angle (including 90°), except for a parallel orientation.

According to a further embodiment, the first interface has a plug which is designed to transmit current and/or electrical signals, and wherein the second interface has a first receptacle which is designed to receive the plug.

The plug can be used, for example, to supply the basic device with power. Control signals can also be transmitted between the safety door monitoring module and a control unit.

The arrangement of the plug at the first interface has the particular advantage that the plug can be used in the first position, the second position and the third Position is accessible. Accessible means that the plug or the first interface is not covered by the protective door or mounting surface. The mounting bracket can also advantageously function as a plug holder at the same time. However, it is conceivable that the plug is connected to the base unit at a different location.

According to a further embodiment, the plug and/or the mounting bracket has an anti-twisting device which is designed to secure the plug rotationally with respect to the axis of the base unit in the first receptacle.

The anti-twisting device has the particular advantage that one or more electrical connections, such as cables, which can electrically connect the plug to the base unit, are held in one position and cannot be twisted around the axis of the base unit due to an unwanted rotation of the plug. For example, if the safety door monitoring module (and in particular the mounting bracket) is mounted on a safety door or mounting surface, electrical connections could be damaged by multiple rotations of the plug. The anti-twisting device therefore has a positive effect on the safety and reliability of the safety door monitoring module.

On the other hand, the anti-twisting device causes the plug to rotate with the mounting bracket when the mounting bracket is rotated from one position to another. In other words, the alignment of the plug to the mounting bracket is fixed in the direction of rotation around the axis of the base unit. For example, even when the mounting bracket is rotated from the first position to the second position to the third position.

Preferably, the first receptacle of the mounting bracket has an inner contour and the plug has a corresponding outer contour, wherein the inner contour and the outer contour secure the plug rotationally in relation to the axis of the base unit in the first receptacle.

Particularly preferably, the plug has a plug head with an outer contour and the first receptacle of the mounting bracket has a corresponding inner contour, so that rotation of the plug about the longitudinal axis of the base unit is prevented.

Advantageously, the anti-twisting device further comprises a positioning device which allows the plug to be accommodated in the first receptacle of the mounting bracket in only one specific position.

This means that the plug is always aligned the same relative to the mounting bracket, particularly in the first position, the second position and the third position. If the plug is connected to a connector plug, this design has the particular advantage that the connector plug can also always be arranged in the same orientation relative to the mounting bracket. This is particularly advantageous if the connector plug can only be connected to the plug in a certain orientation to the plug. This is also advantageous if the connector plug requires a certain amount of space and can or should only be aligned in certain orientations relative to the protective door or the mounting surface.

For example, the plug is essentially cylindrical and has a flattened cylinder surface, wherein the first receptacle of the mounting bracket has a corresponding inner contour.

According to a further embodiment, the plug and/or the mounting bracket has a second axial lock, which axially secures the plug in the first receptacle along the axis of the base unit.

Preferably, the plug has a body with a head, wherein the first receptacle receives the body of the plug and the head of the plug locks along the axis of the base unit with a locking element of the mounting bracket.

Preferably, the second axial securing means comprises a thread and a nut. For example, the plug has a cylinder shape with a thread, with a nut on the thread is screwed on, which fixes the plug axially along the axis of the base unit to the mounting bracket.

According to a further embodiment, the first interface has a plurality of second receptacles and the second interface has a plurality of third receptacles, wherein at least one of the plurality of third receptacles in the first position, the second position and the third position is aligned with one of the plurality of second receptacles of the first interface, and wherein the plurality of second receptacles and the plurality of third receptacles are each designed to receive a fastening means for coupling the first interface to the second interface.

This design has the advantage of providing positioning assistance for the user. This means that the user is supported in aligning the mounting bracket relative to the base unit in the first position, the second position and the third position. This can have a positive effect on the assembly process by showing the user the appropriate positions in a simplified manner and thus relieving the user of the burden of considering the assembly.

In particular, in a design with a recess that runs less than 360° around the axis of the base unit, a continuous transition between the first position, the second position and the third position is possible. In particular, in this design, second receptacles and third receptacles that are aligned with one another can show the user the first position, the second position and the third position.

In a preferred embodiment, the first interface has four second receptacles and the second interface has four third receptacles, wherein the second receptacles and the third receptacles are arranged on corner points of a square.

Preferably, the fastening means comprises a screw. For example, the mounting bracket is attached to the base unit with four screws, the first interface having four second receptacles and the second interface having four third receptacles, wherein a second and a corresponding third receptacle each accommodate a screw. In other words, the longitudinal axes of the four screws each run parallel to a longitudinal axis of a second and a third receptacle corresponding to it depending on the position. It is understood that this applies to the first position, the second position and the third position, whereby the mounting bracket can only be in one position at a time.

According to a further embodiment, the mounting bracket has a mounting side which is arranged transversely to the second interface of the mounting bracket, and the mounting side of the mounting bracket has a fourth receptacle which is designed to receive a fastening means for fastening the mounting bracket to a mounting surface.

Preferably, the fastening means comprises a screw with which the mounting side of the mounting bracket can be fastened to a protective door or to a mounting surface.

According to a further embodiment, the plug has a poka-yoke element.

The Poka-Yoke element has the advantage that a connector plug can only be connected to the connector in a certain orientation relative to the connector. This has a positive effect on the assembly process, as incorrect assembly can be prevented. Another advantage is that the Poka-Yoke element can prevent a connector plug from being connected that is not suitable for connection to the safety door monitoring module.

As already mentioned at the beginning, a further aspect of the present invention relates to a protective door on which a protective door monitoring module according to the invention is mounted. The design options mentioned above and defined in the dependent claims also relate equivalently to the protective door with the protective door monitoring module according to the invention.

The safety door preferably has a first part on which the basic device of the safety door monitoring module is arranged, and a second part on which the actuator of the safety door monitoring module is arranged. The two parts of the safety door are separated from each other when the safety door is opened. The actuator is therefore only located in the actuator holder of the basic device when the safety door is closed.

Preferably, the first part of the safety door on which the base unit is arranged is a stationary part of the safety door (e.g. a door frame or a door casing). Equivalently, the second part of the safety door on which the actuator is arranged is preferably a movable door element (e.g. a door leaf). The arrangement of the base unit on the stationary part of the safety door has the advantage that the part of the safety door monitoring module mounted on the movable part of the safety door does not need to be supplied with power, since typically only the base unit of the safety door monitoring module needs to be supplied with power.

As already mentioned at the beginning, a further aspect of the present invention relates to a protective door monitoring system which has a protective door of the aforementioned type (including the protective door monitoring module according to the invention), an actuator and a control unit.

It is understood that the features mentioned above and those to be explained below can be used not only in the combination specified in each case, but also in other combinations or on their own, without departing from the scope of the present invention.

Fig. 1

eine schematische Darstellung eines Schutztürüberwachungssystems gemäß einem Ausführungsbeispiel der vorliegenden Erfindung;

Fig. 2A

eine perspektivische Ansicht einer Schutztür mit einem Schutztürüberwachungsmodul gemäß einem Ausführungsbeispiel der vorliegenden Erfindung;

Fig. 2B

eine Front-Ansicht der in Fig. 2A gezeigten Schutztür;

Fig. 2C

eine Seitenansicht der in Fig. 2A und Fig. 2B gezeigten Schutztür;

Fig. 3

eine Explosionsdarstellung eines Schutztürüberwachungsmoduls gemäß einem Ausführungsbeispiel der vorliegenden Erfindung;

Fig. 4

eine perspektivische Ansicht des in Fig. 3 gezeigten Schutztürüberwachungsmoduls;

Fig. 5

eine perspektivische Ansicht des in Fig. 3 und Fig. 4 gezeigten Schutztürüberwachungsmoduls zur schematischen Veranschaulichung einer Bewegung eines Montagewinkels;

Fig. 6A

eine perspektivische Ansicht des in Fig. 3-5 gezeigten Schutztürüberwachungsmoduls mit dem Montagewinkel in der ersten Position;

Fig. 6B

eine perspektivische Ansicht des in Fig. 3-5 gezeigten Schutztürüberwachungsmoduls mit dem Montagewinkel in der zweiten Position;

Fig. 6C

eine perspektivische Ansicht des in Fig. 3-5 gezeigten Schutztürüberwachungsmoduls mit dem Montagewinkel in der dritten Position;

Fig. 7

eine perspektivische Ansicht eines Montagewinkels gemäß einem Ausführungsbeispiels der vorliegenden Erfindung;

Fig. 8A

eine perspektivische Ansicht einer an dem Schutztürüberwachungsmodul angeordneten ersten Schnittstelle gemäß einem Ausführungsbeispiel der vorliegenden Erfindung;

Fig. 8B

eine perspektivische Ansicht der an dem Schutztürüberwachungsmodul angeordneten ersten Schnittstelle gemäß einem alternativen Ausführungsbeispiel der vorliegenden Erfindung;

Fig. 9

eine Schnittdarstellung des in Fig. 3-5 gezeigten Schutztürüberwachungsmoduls;

Fig. 10

eine perspektivische Ansicht eines Steckers gemäß einem Ausführungsbeispiel der vorliegenden Erfindung;

Fig. 11

eine Explosionsdarstellung des Montagewinkels und des Steckers gemäß einem Ausführungsbeispiel der vorliegenden Erfindung;

Fig. 12A

eine perspektivische Ansicht des Montagewinkels gemäß einem weiteren Ausführungsbeispiel der vorliegenden Erfindung; und

Fig. 12B

eine perspektivische Ansicht des Montagewinkels gemäß noch einem weiteren Ausführungsbeispiel der vorliegenden Erfindung.

Embodiments of the invention are shown in the drawings and are explained in more detail in the following description. They show:

Fig.1

a schematic representation of a protective door monitoring system according to an embodiment of the present invention;

Fig. 2A

a perspective view of a protective door with a protective door monitoring module according to an embodiment of the present invention;

Fig. 2B

a front view of the Fig. 2A shown protective door;

Fig. 2C

a side view of the Fig. 2A and Fig. 2B shown protective door;

Fig.3

an exploded view of a protective door monitoring module according to an embodiment of the present invention;

Fig.4

a perspective view of the Fig.3 shown protective door monitoring module;

Fig.5

a perspective view of the Fig.3 and Fig.4 shown protective door monitoring module for schematically illustrating a movement of a mounting bracket;

Fig. 6A

a perspective view of the Fig. 3-5 shown protective door monitoring module with the mounting bracket in the first position;

Fig. 6B

a perspective view of the Fig. 3-5 shown protective door monitoring module with the mounting bracket in the second position;

Fig. 6C

a perspective view of the Fig. 3-5 shown protective door monitoring module with the mounting bracket in the third position;

Fig.7

a perspective view of a mounting bracket according to an embodiment of the present invention;

Fig. 8A

a perspective view of a first interface arranged on the protective door monitoring module according to an embodiment of the present invention;

Fig. 8B

a perspective view of the first interface arranged on the protective door monitoring module according to an alternative embodiment of the present invention;

Fig.9

a sectional view of the Fig. 3-5 shown protective door monitoring module;

Fig.10

a perspective view of a connector according to an embodiment of the present invention;

Fig. 11

an exploded view of the mounting bracket and the plug according to an embodiment of the present invention;

Fig. 12A

a perspective view of the mounting bracket according to another embodiment of the present invention; and

Fig. 12B

a perspective view of the mounting bracket according to yet another embodiment of the present invention.

Fig.1 shows a schematic view of an embodiment of a protective door monitoring system according to the invention. The protective door monitoring system is designated in its entirety with the reference number 10.

The safety door monitoring system 10 here includes a robot 12 whose working area is secured by means of a safety door 14. A safety door monitoring module 16 according to the present invention is arranged on the safety door 14. The safety door monitoring module 16 comprises a door part 17, which is arranged on the movable door element (door leaf) of the safety door 14, and a frame part 18, which is arranged on an immovable second part 20 of the safety door 14. In the exemplary embodiment shown, the immovable second part 20 of the safety door 14 is a door frame or a door casing. In other exemplary embodiments, this second immovable part 20 of the safety door 14 can also be a second door leaf of a two-part safety door.

The frame part 18 of the safety door monitoring module 16 is connected to a safety switching device 26 via two lines 22, 24. The safety switching device 26 is, for example, a safety switching device from the PNOZ< ^® > series, which is sold by the applicant of the present invention. This is a multi-channel redundant Safety switching device that is designed to evaluate the output signals from signaling devices, such as the safety door monitoring module 16, and to switch off an electrical consumer as a function of this. In this case, the electrical consumer is the robot 12. Accordingly, the safety switching device 26 controls two contactors 28, 30, whose working contacts are arranged in the connection between a power supply 32 and the robot 12.

As an alternative to the safety switching device 26, the protective door monitoring module 16 could also be connected to a programmable safety controller, as sold by the applicant of the present invention under the name PSS< ^® >. The safety switching device 26 is therefore referred to generally below as the control unit 26 of the protective door monitoring system 10, without being limited to a specific design of this control unit. Several embodiments of the protective door monitoring module 16 according to the invention are described below. Identical or equivalent components are designated with the same reference numerals.

Fig. 2A-2C show an embodiment of the protective door 14 with the protective door monitoring module 16 mounted thereon according to an embodiment in different views. Fig. 2A shows the protective door 14 in a perspective view in a closed position. Fig. 2B shows the closed protective door 14 in a front view and Fig. 2C the closed protective door 14 in a side view.

The safety door monitoring module 16 has a base unit 34 and an actuator 36 that interacts with the base unit 34. The base unit 34 preferably comprises one or more sensors and/or other electronic components and is therefore preferably connected to a power supply. Furthermore, the base unit 34 is preferably connected to the control unit 26 via multi-channel redundant lines, such as lines 22, 24 here. The base unit 34 therefore preferably forms the previously mentioned frame part 18 of the safety door monitoring module 16.

Although it would also be conceivable to use the basic device 34 as the door part 17 of the protective door monitoring module 16, this is less preferred. In such a case, the usually fixed wiring with the control unit 26 and the power supply would have to be routed to the moving part of the protective door 14, which is generally more complicated than routing the cables 22, 24 and the power supply to the static part 20 of the protective door 14.

The actuator 36 acts as a counterpart to the base unit 34 and serves to actuate the base unit 34. The base unit 34 has a corresponding actuator holder 38 into which the actuator 36 can be inserted (see Fig. 2A-2C ).

One function of the base unit 34 is to detect whether the actuator 36 is inserted into the actuator receptacle 38 or not. For this purpose, the actuator 36 preferably has an RFID chip that can be read by a detector arranged in the actuator receptacle 38. The base unit 34 is designed to generate a safety door signal when the actuator 36 is inserted into the actuator receptacle 38. This safety door signal is preferably generated as an electrical signal. This can be a digital, pulsed, coded and/or other (preferably electrical) signal.

By evaluating the safety door signal in the control unit 26, the safety door monitoring system 10 can clearly determine at any time whether the safety door 14 is closed or not. The robot 12 can be controlled depending on this in such a way that it can only be operated when the safety door 14 is closed.

In the Fig. 2A-2C In the embodiment shown, the actuator 36 has a substantially rod/pin-shaped actuator element 40, which can be inserted into the actuator receptacle 38. On its end face inserted into the actuator receptacle 38, the actuator element 40 has a through hole (not shown) designed as a catch bore, into which a counterholder 68 arranged in the actuator receptacle 38, which has a bolt (see Fig.3 and 9 ) to hold the actuator 36 in the actuator holder 38, for example during the activation of a locking function.

As in Fig. 2A-2C As shown, the actuator element 40 is inserted into the actuator receptacle 38 in the closed state of the protective door 14. It is understood that the actuator receptacle 38 of the protective door monitoring module 16 of the present invention is not intended to be limited to the reception of rod/pin-shaped actuator elements 40, but is designed to receive actuators 36 in general, which have an actuator element 40 that is particularly suitable in terms of shape.

In the Fig. 2A-2C In the embodiment shown, the protective door 14 has a handle 42 with which a user can open or close the protective door 14. The protective door 14 is designed here as a pivoting door, but can in principle also be designed as a sliding door or any other type of separating protective device (for example as a flap).

Fig.3 shows an exploded view of the basic device 34 with a mounting bracket 46 of the protective door monitoring module 16 that can be mounted on it. The basic device 34 extends along an axis 50, which here corresponds to a central or longitudinal axis of the basic device 34. The basic device 34 has a first interface 44 (see also Fig.5 , 8A, 8B ) which interacts with a second interface 48 provided on the mounting bracket 46. The first interface 44 and the second interface 48 are designed to be coupled to one another.

The actuator receptacle 38 is designed to accommodate the actuator 36 from a first direction 52, from a second direction 54 rotated 90° counterclockwise to the first direction 52 about the axis 50, and from a third direction 56 rotated 90° counterclockwise to the second direction 54 about the axis 50. The actuator 36 can therefore be inserted into the actuator receptacle 38 from at least three different directions 52, 54, 56. According to a preferred embodiment, the actuator 36 can be inserted into the actuator receptacle 38 from precisely these three different directions 52, 54, 56 (and no other direction). These three directions 52, 54, 56 all lie in a common plane.

In the Fig.3 In the embodiment of the protective door monitoring module 16 shown, the actuator 36 can also be inserted into the actuator receptacle 38 from intermediate directions which are rotated by an angle of <90° around the axis 50 with respect to the directions 52, 54, 56 and are arranged in a common plane with the directions 52, 54, 56. The actuator 36 can be inserted into the actuator receptacle 38 with a linear movement and/or a rotary movement.

The base unit 34 also has one or more optical control displays 58 which indicate a state of the protective door monitoring module 16. Furthermore, an operating device 60 is provided by means of which a user can change a state of the protective door monitoring module 16, for example in order to block one or more functions of the protective door monitoring module 16. For example, the operating device 60 is designed to manually deactivate the locking function of the protective door monitoring module 16 by unlocking the counterholder or locking bolt 68.

In the Fig.3 In the embodiment shown, the mounting bracket 46 has a substantially L-shaped cross-section. The mounting bracket 46 has a mounting side 62 which is arranged transversely, preferably orthogonally, to the second interface 48 of the mounting bracket 46. A fourth receptacle 64 is provided on the mounting side 62, which is designed to receive a fastening means, such as a screw, for fastening the mounting bracket 46 to, for example, the immovable second part 20 of the protective door 14.

The mounting bracket 64 is also designed to accommodate a plug 66, which is connected to the base unit 34 and can be part of the first interface 44. The mounting bracket 46 comprises a first receptacle 70, which accommodates the plug 66. The plug 66 is designed to connect the base unit 34 to a connection plug. With the help of the plug 66, the base unit 34 of the protective door monitoring module 16 can be connected, for example, to a power supply 32 and/or to the control unit 26.

The plug 66 is secured axially along the axis 50 to the mounting bracket 46 by means of an axial lock 72 (referred to herein as "second axial lock"). The axial lock 72 comprises a nut 74 which can be screwed onto an external thread (not shown) provided on the plug 66. Furthermore, the axial lock 72 comprises a counterholder 75 arranged in the mounting bracket 46 for the head 77 of the plug 66 (see Fig.9 and 12A ). In the assembled state, the plug 66 is thus axially secured in the first receptacle 70 of the mounting bracket 46, whereby the head 77 of the plug 66 is pressed in the axial direction against the counterholder 75 by means of the nut 74 (see Fig.9 ).

The mounting bracket 46 is attached to the base unit 34 by means of a plurality of fastening means 76. In this case, the first interface 44 has four receptacles 78 (referred to here as "second receptacles") (see Fig. 8A and 8B ). Likewise, the second interface 48 has four receptacles 80 (here referred to as "third receptacles") (see Fig.7 , 12A and 12B ). The second receptacles 78 and the third receptacles 80 are designed to accommodate the fastening means 76, which are preferably designed as screws. If the second receptacles 78 and the third receptacles 80 are aligned with one another, a second receptacle 78 and a third receptacle 80 can each jointly accommodate a fastening means 76 in order to fasten the mounting bracket 46 to the base unit 34. In the exemplary embodiment shown here, the second receptacles 78 and the third receptacles 80 are each designed as through holes which together form a square hole pattern. In other words, the center axes of the through holes forming the receptacles 78, 80 are arranged on corner points of a square in the plan view.

According to the invention, the mounting bracket 46 can be attached to the base unit 34 in different positions. This makes it possible to attach the base unit 34 in different orientations relative to the immovable second part 20 of the protective door 14. The mounting bracket 46 can be in a first position (see Fig. 6A ), a second position (see Fig. 6B ) and a third position (see Fig. 6C ) must be coupled to the base unit 34. Fig.5 schematically indicates, with the help of arrow 82, a direction of rotation in which the mounting bracket 46 rotates relative to the base unit 34 around the axis 50 can be pivoted. Of course, the mounting bracket 46 can only be pivoted relative to the base unit 34 when the fastening means 76 are loosened.

Fig. 6A shows the mounting bracket 46 in its first position relative to the base unit 34. Fig. 6B shows the mounting bracket 46 in its second position relative to the base unit 34. Fig. 6C shows the mounting bracket 46 in its third position relative to the base unit 34. The second position is rotated 90° clockwise relative to the first position around the axis 50 of the base unit 34. The third position is rotated 90° clockwise relative to the second position around the axis 50 of the base unit 34.

A coupling of the first interface 44 with the second interface 48 in a fourth position rotated 90° clockwise to the third position about the axis 50 of the basic device 34 is prevented by a mechanical locking device 90 to avoid incorrect assembly, as explained in detail below (see Fig. 7, Fig. 8A and Fig. 8B ). The mounting bracket 46 can thus be arranged in exactly three different, predefined positions relative to the base unit 34. The fourth position can be a position which is unfavorable for the actuator holder 38 with regard to the reception of the actuator 36, since the actuator 36 cannot or can only engage poorly in the actuator holder 38.

When the mounting bracket 46 is attached to the base unit 34 in its first position, the mounting side 62 of the mounting bracket 46 is aligned orthogonally to the first direction 52 ( Fig. 6A ). If, however, the mounting bracket 46 is attached to the base unit 34 in its second position, the mounting side 62 of the mounting bracket 46 is aligned orthogonally to the second direction 54 ( Fig. 6B ). In the third position, the mounting side 62 of the mounting bracket 46 is aligned orthogonally to the third direction 56 ( Fig. 6C ).

The base unit 34 further has a first through hole 84 in the region of its upper end and a second through hole 86 extending to the first through hole 84. In the first position of the mounting bracket 46, the first through hole 84 extends orthogonally to the mounting side 62 ( Fig. 6A ), in the second position the second through hole 86 orthogonal to the mounting side 62 ( Fig. 6B ) and in the third position the first through hole 84 is orthogonal to the mounting side 62 ( Fig. 6C ).

Thus, the base unit 34 can be attached to the immovable second part 20 of the protective door 14 with a fastening means (e.g. a screw) inserted into the first through hole 84, if the Fig. 6A shown first position of the mounting bracket 46 is selected. The through hole 84 then runs parallel to the fourth receptacle 64 provided on the mounting bracket 46, which is used to fasten the mounting bracket 46 to the immovable second part 20 of the protective door 14 by means of a further fastening means (eg a screw).

In the Fig. 6B In the second position of the mounting bracket 46 shown, the second through hole 86 runs parallel to the fourth receptacle 64, so that the base unit 34 can then be fastened together with the mounting bracket 46 to the immovable second part 20 of the protective door 14 by passing one fastening means through the second through hole 86 and another fastening means through the fourth receptacle 64.

In a similar manner, the base unit 34 can be attached together with the mounting bracket 46 to the immovable second part 20 of the protective door 14 by passing a fastening means through the second through hole 84 and another fastening means through the fourth receptacle 64 when the Fig. 6C shown third position of the mounting bracket 46 is selected.

The base unit 34 has a first side surface 112, a second side surface 114, a third side surface 116 and a fourth side surface 118. The first side surface 112 is arranged on the left side of the base unit 34. The second side surface 114 is arranged on the back of the base unit 34. The third side surface 116 is arranged on the right side of the base unit 34. The fourth side surface 118 is arranged on the front of the base unit 34. The first side surface 112 runs parallel to the third side surface 116. The second side surface 114 runs parallel to the fourth side surface 118 and transversely to the first and third side surfaces 112, 116.

In the first position, the mounting side 62 of the mounting bracket 46 is aligned parallel to the first side surface 112 or is flush with it ( Fig. 6A ). In the second position, the mounting side 62 of the mounting bracket 46 is aligned parallel to the second side surface 114 or is flush with it ( Fig. 6B ). In the third position, the mounting side 62 of the mounting bracket 46 is aligned parallel to the third side surface 116 or is flush with it ( Fig. 6C ). As already mentioned, an alignment of the mounting side 62 of the mounting bracket 46 parallel to or flush with the fourth side surface 118 is prevented according to the invention by the mechanical locking device 90.

The mechanical locking device 90 is particularly Figs. 7, 8A and 8B The mechanical locking device 90 has a locking element 88 arranged on the second interface 48 on the mounting bracket 46 and at least one recess 89 acting as a counterpart thereto, which is arranged on the first interface 44 of the base unit 34. The at least one recess 89, 89' receives the mechanical locking element 88 in the first position, the second position and the third position of the mounting bracket 46. However, the mechanical locking device 90 prevents a coupling of the first interface 44 with the second interface 48 in the fourth position.

Fig. 8A and 8B show two different embodiments of the part of the mechanical locking device 90, which is provided on the first interface 44 arranged on the base unit 34. The Fig. 8A The recess shown has three spatially separated recesses 89 which are designed to accommodate the mechanical locking element 88 in one of the first position, the second position or the third position. In order to rotate the mounting bracket 46, for example, from the first position to the second position, the mounting bracket 46 must be lifted axially along the axis 50 of the base unit 34 and can then be brought into another position by inserting the locking element 88 attached to the mounting bracket 46 into one of the other two recesses 89.

In the Fig. 8B In the embodiment shown, the recess 89' is designed as a recess that runs around the axis 50 of the base unit 34 by less than 360°. This preferred embodiment of the recess 89' has the particular advantage that the mounting bracket 46 can be rotated continuously from one position to another position without the mounting bracket 46 having to be lifted axially along the axis 50 of the base unit 34. A suitable position (the first position, the second position or the third position) is indicated to a user by means of one of the plurality of second receptacles 78 and a plurality of third receptacles 80 aligned therewith. A user can therefore rotate the mounting bracket 46 continuously until the user recognizes a suitable position due to the second and third receptacles 78, 80 being aligned with one another.

The recess 89`, which extends less than 360° around the axis 50 of the base unit 34, can also prevent a complete rotation of the plug 66 around the axis 50 of the base unit 34. This can be particularly advantageous if the plug 66 is connected to the base unit 34 via electrical lines 92, which are to be protected from being twisted multiple times (see Fig.9 ).

One in Fig.9 The axial lock 94 shown (referred to herein as the "first axial lock"), which secures the mounting bracket 46 along the axis 50 to the base unit 34, can be particularly advantageous in combination with the recess 89' which extends less than 360°. The first axial lock 94 has a side wall 96 which is detachably arranged on the base unit 34 and has a mechanical locking element 98 (referred to herein as the "second mechanical locking element") and a receptacle 100 (referred to herein as the "fifth receptacle") arranged on the mounting bracket 46. To mount the mounting bracket 46 on the base unit 34, the side wall 96 can be detached from the housing of the base unit 34. The mounting bracket 46 can then be inserted into the base unit 34, for example together with the plug 66. The detachable side wall 96 can then be reattached to the base unit 34 so that the second mechanical locking element 98 arranged on the side wall 96 engages in the receptacle 100 of the mounting bracket 46 and secures the mounting bracket 46 along the axis 50 of the base unit 34. If the position of the mounting bracket 46 is subsequently to be changed, this can be done by simply loosening the fastening means 76 and then rotating the mounting bracket 46 about the axis 50. The mounting bracket 46 remains in its axially secured position during the rotation. Damage to or even tearing off of the electrical cables 92 can thus be effectively prevented.

Fig.10 shows a perspective view of an embodiment of the plug 66. The plug 66 can have a poka-yoke element 102, which is designed to connect the plug 66 in only one specific orientation to a connector plug (eg for connection to the power supply 32 and/or the control unit 26). This poka-yoke element 102 is often also referred to as coding of the plug 66.

A positioning device 104 provided on the plug 66 and the first receptacle 70 of the mounting bracket 46 ensures, similar to a Poka-Yoke element, that the first receptacle 70 can only accommodate the plug 66 in a certain orientation. In the Fig. 10 and Fig. 11 In the embodiment shown, the plug 66 is essentially cylindrical and has a flattened cylinder surface 106 which, in the assembled state, rests against a flat stop surface 108 provided on the mounting bracket 46. The positioning device 104 is thus formed by the flattened cylinder surface 106 and the stop surface 108.

Fig. 12A and Fig. 12B show two embodiments of the mounting bracket 46. The main difference between these two embodiments is the type of design of the first receptacle 70 to form an anti-twist device 110, which prevents the plug 66 from twisting relative to the mounting bracket 46. In both cases, the first receptacle 70 of the mounting bracket 46 has an inner contour corresponding to the outer contour of the plug head 77, so that the plug 66 is secured against rotation about the axis 50 of the base unit 34. In the Fig. 12A In the embodiment shown, the first receptacle 70 has a hexagonal inner contour formed from six partial surfaces. In the embodiment shown in Fig. 12B In the embodiment shown, the individual partial areas are additionally divided into two sub-partial areas by a recess 112.

It is understood that the embodiments shown in the figures merely show exemplary configurations of the protective door monitoring module 16 according to the invention, which are intended to illustrate the advantages of the protective door monitoring module 16 according to the invention. Various modifications can be made to these embodiments without departing from the scope of the present invention.

List of reference symbols

10

Safety door monitoring system

12

robot

14

Protective door

16

Safety door monitoring module

17

Door part

18

Frame part

20

immovable part

22, 24

cables

26

Control unit

28, 30

Protect

32

Power supply

34

Basic device

36

Actuator

38

Actuator holder

40

Actuator element

42

Handle

44

first interface

46

Mounting bracket

48

second interface

50

axis

51

first front side

52

first direction

54

second direction

56

third direction

58

Control indicators

60

Control device

62

Mounting side

64

fourth recording

66

Plug

68

Counterholder

70

first recording

72

second axial lock

74

Mother

75

Counterholder

76

Fasteners

77

Head

78

second recordings

80

third recordings

82

Direction of rotation

84

first through hole

86

second through hole

88

first mechanical locking element

89, 89'

Recess

90

mechanical locking device

92

cables

94

first axial locking

96

Side wall

98

second mechanical locking element

100

fifth recording

102

Poka-Yoke element

104

Positioning device

106

flattened cylinder surface

108

Stop surface

110

Anti-twist device

112

first side surface

114

second side surface

116

third side surface

118

fourth side surface

Claims (15)

Protective door monitoring module (16) for monitoring a state of a protective door (14), comprising: - a base unit (34) for generating a protective door signal, which has an actuator receptacle (38) for receiving an actuator (36) and is designed to generate a protective door signal when the actuator (36) is inserted into the actuator receptacle (38) of the base unit (34), wherein the base unit (34) has an axis (50) and a first end face (51) arranged transversely to the axis (50) with a first interface (44); and - a mounting bracket (46) with a second interface (48) which is designed to be coupled to the first interface (44) of the base unit (34) in a first position, a second position rotated 90° clockwise to the first position about the axis (50) of the base unit (34), and a third position rotated 90° clockwise to the second position about the axis (50) of the base unit (34);
wherein the first interface (44) and the second interface (48) have a mechanical locking device (90) which is designed to prevent a coupling of the first interface (44) with the second interface (48) in a fourth position rotated 90° clockwise to the third position about the axis (50) of the base unit (34). Protective door monitoring module according to claim 1, wherein the mounting bracket (46) has a mounting side (62) which is arranged transversely to the second interface of the mounting bracket (46), wherein the actuator receptacle (38) is designed to receive an actuator (36) in a first direction (52), in a second direction (54) rotated 90° counterclockwise to the first direction (52) about the axis (50) of the base unit (34), and in a third direction (56) rotated 90° counterclockwise to the second direction (54) about the axis (50) of the base unit (34), and wherein in the first position the mounting side (62) is orthogonal to the first direction (52), in the second position the mounting side (62) is orthogonal to the second direction (54) and in the third position the mounting side (62) is orthogonal to the third direction (56). Protective door monitoring module (16) according to one of the preceding claims, the mechanical locking device (90) has a mechanical locking element (88) and a recess (89, 89`), wherein one of the two interfaces has the mechanical locking element (88) and the other interface has the recess (89, 89`), which is designed to receive the mechanical locking element (88) in the first position, the second position and the third position and to prevent the fourth position. Protective door monitoring module (16) according to claim 3, wherein the recess (89`) is a recess (89`) that extends around the axis (50) of the base unit (34) by less than 360°. Protective door monitoring module (16) according to one of the preceding claims, wherein the base unit (34) and/or the mounting bracket (46) has a first axial lock (94) which axially secures the mounting bracket (46) along the axis (50) of the base unit (34). Protective door monitoring module (16) according to claim 5, wherein the base unit (34) has a releasably attached side wall (96) which comprises a part of the first axial lock (94). Protective door monitoring module (16) according to one of the preceding claims, wherein the mounting bracket (46) has a mounting side (62) which is arranged transversely to the second interface (48) of the mounting bracket (46), wherein the base device (34) has a first through hole (84) and a second through hole (86) extending orthogonally to the first through hole (84), and where in the first position and the third position the first Through hole (84) runs orthogonal to the mounting side (62) and in the second position (84) the second through hole (86) runs orthogonal to the mounting side (62). Protective door monitoring module (16) according to one of the preceding claims, wherein the mounting bracket (46) has a mounting side (62) which is arranged transversely to the second interface (48) of the mounting bracket (46), wherein the base unit (34) has a first side surface (112), a second side surface (114) and a third side surface (116) which are arranged substantially transversely to the first end face (51), and wherein the mounting side (62) of the mounting bracket (46) is aligned with or parallel to the first side surface (112) in the first position, aligned with or parallel to the second side surface (114) in the second position, and aligned with or parallel to the third side surface (116) in the third position. Protective door monitoring module (16) according to one of the preceding claims, wherein the first interface (44) has a plug (66) which is designed to transmit current and/or electrical signals, and wherein the second interface (48) has a first receptacle (70) which is designed to receive the plug (66). Protective door monitoring module (16) according to claim 9, wherein the plug (66) and/or the mounting bracket (46) have an anti-twist device (110) which secures the plug (66) rotationally with respect to the axis (50) of the base unit (34) in the first receptacle (70). Protective door monitoring module (16) according to claim 9 or 10, wherein the plug (66) and/or the mounting bracket (46) have a second axial lock (72) which axially secures the plug (66) in the first receptacle (70) along the axis (50) of the base unit (34). Protective door monitoring module (16) according to one of the preceding claims, wherein the first interface (44) has a plurality of second receptacles (78) and the second interface (48) has a plurality of third receptacles (80), wherein at least one of the plurality of third receptacles (80) in the first position, the second position and the third position is aligned with one of the plurality of second receptacles (78) of the first interface (44), and wherein the plurality of second receptacles (78) and the plurality of third receptacles (80) are each configured to receive a fastening means (76) for coupling the first interface (44) to the second interface (48). Protective door monitoring module (16) according to one of the preceding claims, wherein the mounting bracket (46) has a mounting side (62) which is arranged transversely to the second interface (48) of the mounting bracket (46), and wherein the mounting side (62) of the mounting bracket (46) has a fourth receptacle (64) which is designed to receive a fastening means for fastening the mounting bracket (46) to a mounting surface. Protective door monitoring module (16) according to one of claims 9 to 13, wherein the connector (66) has a poka-yoke element (102). Safety door monitoring system (10) with: - a protective door (14) as access to a safety area, - a protective door monitoring module (16) according to one of claims 1 to 14 for monitoring a state of the protective door (14), - an actuator (36) and - a control unit (26) which is designed to read the protective door signal and to control a machine or system (12) located in the safety area depending on the protective door signal.

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